ICD-10-CM 2027
ICD-10 code for bipolar disorder
Confirmed by the official ICD-10-CM index entry “disorder (of) › bipolar (i) (seasonal) (type 1)”. Page updated September 29, 2026.
About coding bipolar disorder
The ICD-10-CM code for bipolar disorder is F31.9 (Bipolar disorder, unspecified). The official index lists 27 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on F31.9.
Within F31, choose F31.9 (unspecified) only when documentation doesn't support a more specific option: current episode hypomanic (F31.0), current episode manic without psychotic features (F31.1), current episode manic severe with psychotic features (F31.2), current episode depressed, mild or moderate severity (F31.3), current episode depressed, severe, without psychotic features (F31.4), current episode depressed, severe, with psychotic features (F31.5), current episode mixed (F31.6), currently in remission (F31.7) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 885 (Psychoses, relative weight 1.3901), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Related Bipolar disorder codes
- F31.0 Bipolar disorder, current episode hypomanic
- F31.10 Bipolar disorder, current episode manic without psychotic features, unspecified
- F31.11 Bipolar disorder, current episode manic without psychotic features, mild
- F31.12 Bipolar disorder, current episode manic without psychotic features, moderate
- F31.13 Bipolar disorder, current episode manic without psychotic features, severe
- F31.2 Bipolar disorder, current episode manic severe with psychotic features
- F31.30 Bipolar disorder, current episode depressed, mild or moderate severity, unspecified
- F31.31 Bipolar disorder, current episode depressed, mild
- F31.32 Bipolar disorder, current episode depressed, moderate
- F31.4 Bipolar disorder, current episode depressed, severe, without psychotic features
- F31.5 Bipolar disorder, current episode depressed, severe, with psychotic features
- F31.60 Bipolar disorder, current episode mixed, unspecified
- F31.61 Bipolar disorder, current episode mixed, mild
- F31.62 Bipolar disorder, current episode mixed, moderate
- F31.63 Bipolar disorder, current episode mixed, severe, without psychotic features
- F31.64 Bipolar disorder, current episode mixed, severe, with psychotic features
- F31.70 Bipolar disorder, currently in remission, most recent episode unspecified
- F31.71 Bipolar disorder, in partial remission, most recent episode hypomanic
- F31.72 Bipolar disorder, in full remission, most recent episode hypomanic
- F31.73 Bipolar disorder, in partial remission, most recent episode manic
- F31.74 Bipolar disorder, in full remission, most recent episode manic
- F31.75 Bipolar disorder, in partial remission, most recent episode depressed
- F31.76 Bipolar disorder, in full remission, most recent episode depressed
- F31.77 Bipolar disorder, in partial remission, most recent episode mixed
- F31.78 Bipolar disorder, in full remission, most recent episode mixed
- F31.81 Bipolar II disorder
- F31.89 Other bipolar disorder
Common questions about bipolar disorder ICD-10 codes
What is the ICD-10 code for bipolar disorder?
- F31.9 — Bipolar disorder, unspecified. More specific codes apply when the documentation supports them: F31.0, F31.10, F31.11, F31.12 and others below.
What is the ICD-10 code for bipolar disorder, current episode hypomanic?
- F31.0 — Bipolar disorder, current episode hypomanic.
What is the ICD-10 code for bipolar disorder, current episode manic without psychotic features, unspecified?
- F31.10 — Bipolar disorder, current episode manic without psychotic features, unspecified.
What is the ICD-10 code for bipolar disorder, current episode manic without psychotic features, mild?
- F31.11 — Bipolar disorder, current episode manic without psychotic features, mild.
What is the ICD-10 code for bipolar disorder, current episode manic without psychotic features, moderate?
- F31.12 — Bipolar disorder, current episode manic without psychotic features, moderate.
What is the ICD-10 code for bipolar disorder, current episode manic without psychotic features, severe?
- F31.13 — Bipolar disorder, current episode manic without psychotic features, severe.
What is the ICD-10 code for bipolar disorder, current episode manic severe with psychotic features?
- F31.2 — Bipolar disorder, current episode manic severe with psychotic features.
Is F31.9 billable?
- Yes. F31.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F31.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F31.9 as a principal diagnosis.
Is F31.9 a CC or MCC?
- No. F31.9 is neither a CC nor an MCC under MS-DRG v44.0.